Brake-valve device



Feb. 10, 19251 1,525,577

L. A. FOWLER BRAKE VALVE DEVICE Filed May s, 1924 IIIIh INVENTOR LESTER A FOWLER ATTORNEY Patented Feb. 10, 1.925. f

l UNITED VSTATES 1,525,577 PATENT` OFFICE.

LESTER A. FOWLER, OAKLAND, CALIFORNIA, ASSIGNOR TO THE WESTINGHOUSE AIRv BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORATION- OF PENNSYLVANIA.

BRAKE-VALVE DEVICE.

Application filed May 3, 1924. Serial No. 710,793.

To all whom t may concern:

Be it known that I, LESTER A. FowLER, a

citizen of the United States, residing at l metal nut sleeve mem er and si as to ll the screwl Oakland, vin the county of Alameda and State of Calitornia, have invented new and useful Improvements in Brake-'Valve Devices, of which the following is a specification. R

This yinvention relates to fluid pressure brakes, and more particularly to a brake valve device.

Theprincipal ogject of my inventionv isl to provide an imp oved brake valve device for graduating the brakes on andoif.

In the accompanying drawing; Fig. 1 is a vertical section of a brake valve device embodying my invention, the rotary valve seat being sectioned. on line 1-1 of Fig. 4; Fig. 2 a section on the line 2-2 of Fig. 1; Fig. 3 a face View of the rotary valve; and Fie'. 4 a section on the line 4 4 of Fig. 1.

Y s shown in the drawing, the brakevalve device may'comprise a casing 1, having a chamber which is divided into diaphragm chambers 2 and 3 by a flexible diaphragm 4,

the diaphragm being clamped in place by a cover casing 5. Applied to the under side ofl casing 1 is a valve casing 6 having a valve chamber 7 containing a rotary valve 8. Said valve is provided wit an operating 'stem 9 extending upwardly into casing 1 and having cut thereon one or more coarse pitched screw threads 10. The screw threads work in a nut which may comprise a sleeve member 11 having therein a Babbitt ortion 12, which is cast in the threads 10. l

The sleeve member 1l is provided with Vvertical guide ribs 13 adapted to slide in corresponding grooves cut in the surrounding casing 1, and said member is secured to the flexible diaphragm 4.

' A coil spring 14 acting on diaphragm 4 is mounted in chamber 2 and is engaged by a spring follower '15, and an operating handle 16, pivotally mounted on a sleeve 17, secured to casing 5, is adapted .to engage the follower 15.

The valve chamber 7 is connected by pipe 18 to a source of uid under pressure andv diaphragm chamber 3 is connected by pipe 19 to a brake chamber, the admission of pressure to which is adapted toapply. the

rakes.- The valve seat o rotary va ve Sis 4said diaphragm.

provided with ports 20 and 21 leading to chamber' 3 and a port 22 leading to thev tioned to connect ports 20 and 22 through a vcavity 23, so that chamber 3and the brake chamber will be connected to the atmosphere.

When the handle 16 is depressed, the

spring 14 is compressed and exerts pressure on diaphragm 4, so that said diaphragm moves the sleeve member 11 downwardly to cause the rotation of the stem 9 and the rotary valve 8 to a position in which a through port 24 in the rotary valve registers with port 21. Fluid under pressure is then admitted from valve chamber 7 to chamber 3 and thence through pipe 19 to the-brake chamber to ei'ect an application of the brakes.

When the pressure in chamber 3, and acting on diaphragm 4, has been increased to a degree slightly exceeding the pressure of spring 14, the diaphragm will be moved upwardly so as torotate the valve 8 to a.

position in which the further supply of uidto the brake chamber is cut off.

The pressure in the brake chamber may obviously be increased by further depressing the handle 16. The brakes may be released by relieving the pressure on said handle, so that the h1 her pressure in cham- `ber 3 will move the iaphragm 4 upwardly and cause rotation of the valve 8 to release position. L

Having now described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a brake valve device, the combination with afrotatable valve for controlling they brakes and a valve stem for operating said valve having screw threads, of a nonrotatable nut engagin said screw threads, a flexible diaphra m or reciprocating said nut, and means or applying pressure to 2. In a brake valve device, the combination with a rotatable valve for controlling the brakesand a valve stem for operating said valve, of a nut having screw-threaded engagement with said stem, means for preventing rotation of' said nut, a movable abutment for imparting longitudinal movement to Asaid nut for effecting the rotationl said valvey upon axial movement of said diaphragm, andmeans for applying pressure to said diaphragm for operating same. 10 In testimony whereof I'have hereunto set my hand.

LESTER A. FOWLER. 

